Question

3 cosx-cos²x=o решить уравнение

Answer 1

$cos(x)(3 - cos(x)) = 0$ ⇔ $left { {{cos(x) = 0} atop {cos(x) = 3}} right.$ ⇒(т.к. -1 ≤cos(х)≤ 1) $cos(x) = 0$